# One-Way Audio in Asterisk After a Firewall or Network Change?

**URL:** <https://community.asterisk.org/t/one-way-audio-in-asterisk-after-a-firewall-or-network-change/112961>\
**Category:** Asterisk Support\
**Created:** [May 19, 2026, 4:51am UTC](https://community.asterisk.org/t/one-way-audio-in-asterisk-after-a-firewall-or-network-change/112961 "2026-05-19T04:51:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kingasterisk](https://avatars.discourse-cdn.com/v4/letter/k/b782af/32.png) [@kingasterisk](https://community.asterisk.org/u/kingasterisk)\
**Post date:** [May 19, 2026, 4:51am UTC](https://community.asterisk.org/t/one-way-audio-in-asterisk-after-a-firewall-or-network-change/112961/1 "2026-05-19T04:51:56Z")

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Has anyone faced one-way audio issues in Asterisk after a network or firewall change?

We recently diagnosed a case where SIP signaling worked perfectly (calls connected), but RTP audio failed in one direction. The root cause turned out to be incorrect localnet/externip settings and NAT behavior after a subnet update.

We also verified RTP port range, firewall rules, and symmetric RTP settings.

What has been the most common cause of one-way audio in your deployments?

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**Author:** ![system](https://global.discourse-cdn.com/asterisk/original/2X/4/475d0c889911cfb84ac4881ad6df8b523e3f9105.png) [@system](https://community.asterisk.org/u/system)\
**Post date:** [June 18, 2026, 4:51am UTC](https://community.asterisk.org/t/one-way-audio-in-asterisk-after-a-firewall-or-network-change/112961/2 "2026-06-18T04:51:57Z")

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